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Reddy, B. Surendra,Reddy, A. Babul,Reddy, G. Ramachandra,Reddy, P. Raveendra Korean Chemical Society 2011 대한화학회지 Vol.55 No.6
The synthesis, as well as spectroscopic and biological studies of a novel class of [3-(4-substitutedphenylamino)-8-azabicyclo [3.2.1] oct-8yl]-phenyl-methanone derivatives are described. All the synthesized compounds were characterized by elemental analysis FTIR, $^1H$-NMR, $^{13}C$ NMR, and Mass spectral data. All the synthesized compounds were exhibit in vitro antibacterial activity.
Evaluation of mechanical properties for high strength and ultrahigh strength concretes
Murthy, A. Ramachandra,Iyer, Nagesh R.,Prasad, B.K. Raghu Techno-Press 2013 Advances in concrete construction Vol.1 No.4
Due to fast growth in urbanisation, a highly developed infrastructure is essential for economic growth and prosperity. One of the major problems is to preserve, maintain, and retrofit these structures. To meet the requirements of construction industry, the basic information on all the mechanical properties of various concretes is essential. This paper presents the details of development of various concretes, namely, normal strength concrete (around 50 MPa), high strength concrete (around 85 MPa) and ultra high strength concrete (UHSC) (around 120 MPa) including their mechanical properties. The various mechanical properties such as compressive strength, split tensile strength, modulus of elasticity, fracture energy and tensile stress vs crack width have been obtained from the respective test results. It is observed from the studies that a higher value of compressive strength, split tensile strength and fracture energy is achieved in the case of UHSC, which can be attributed to the contribution at different scales viz., at the meso scale due to the fibers and at the micro scale due to the close packing of grains which is on account of good grading of the particles. Micro structure of UHSC mix has been examined for various magnifications to identify the pores if any present in the mix. Brief note on characteristic length and brittleness number has been given.
대체에너지 분야에서의 촉매기술 심포지엄 3 : F-43 ; 활성탄에 고정화된 Metal complex 촉매의 벤젠 hydroxylation 반응 특성 연구
최정식,김태환,추고연,( M. B. Saidutta ),( B. Ramachandra ),이영우 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
화학 산업에서 페놀은 페놀수지, bisphenol-A, caprolactam, adipic acid 및 여러 화학 산업의 주원료 혹은 최종 물질로서 수요의 증가에 따라 생산량이 점점 증가되고 있다. 현재 페놀 제조의 상용화 공정을 살펴보면 페놀 생산량의 약 90%는 Hock 공정(Cumene 산화공정)으로 제조되어지고 나머지는 미국 Dow 사에 의해 제안된 Dow 공정(톨루엔 산화공정)으로 페놀을 제조하고 있다. 활성 금속을 고정화시키는 전략은 여러 가지 방법은 네가지로 요약할 수 있다. 첫째 금속이 framework 내에 치환되는 형태, 둘째 지지체에 graft된 형태, 셋째 spacer 리간드에 의해서 tethered 된 형태, 넷째로 금속 착염이 캡슐화된 ship-in-a-bottle 형태이다. 이런 전략들은 액상 산화반응에 적용되는 촉매의 경우 함침법으로 제조될 때 발생되는 leaching 현상으로 인한 촉매 비활성화를 막아주는 하나의 기술이라 할 수 있다. 본 연구에서는 금속 담지 촉매의 leaching를 막기 위해서 활성탄 지지체에 금속 착화합물을 고정화시킨 형태의 촉매를 제조하여 벤젠에서 페놀로의 직접 합성 연구에 적용하여 그 반응성을 살펴보았다. 사용된 전이금속은 copper acetylacetonate, iron acetylacetonate, vandium acetylacetonate 이다. Feanchored 촉매가 V 촉매(11.4%)에 비해서 페놀 수율이 13.5%로 가장 우수한 결과를 보였다.
Numerical and theoretical modelling of low velocity impact on UHPC panels
Prabhat R. Prem,Mohit Verma,A. Ramachandra Murthy,J. Rajasankar,B.H. Bharatkumar 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.2
The paper presents the studies carried out on low velocity impact of Ultra high performance concrete (UHPC) panels of size 350X350X10 mm3 and 350X350X15 mm3. The panels are cast with 2 and 2.5% micro steel fibre and compared with UHPC without fiber. The panels are subjected to low velocity impact, by a drop-weight hemispherical impactor, at three different energy levels of 10, 15 and 20 J. The impact force obtained from the experiments are compared with numerically obtained results using finite element method, theoretically by energy balance approach and empirically by nonlinear multigenetic programming. The predictions by these models are found to be in good coherence with the experimental results.
Ponnanna, Koushik,DSouza, Stafny M.,Ramachandra, Nallur B. Korea Genome Organization 2021 Genomics & informatics Vol.19 No.1
Cytorace-3 is a laboratory evolved hybrid lineage of Drosophila nasuta nasuta males and Drosophila nasuta albomicans females currently passing ~850 generations. To assess interracial hybridization effects on gene expression in Cytorace-3 we profiled the transcriptomes of mature ovaries and testes by employing Illumina sequencing technology and de novo transcriptome assembling strategies. We found 26% of the ovarian, and 14% of testis genes to be differentially expressed in Cytorace-3 relative to the expressed genes in the parental gonadal transcriptomes. About 5% of genes exhibited additive gene expression pattern in the ovary and 3% in the testis, while the remaining genes were misexpressed in Cytorace-3. Nearly 772 of these misexpressed genes in the ovary and 413 in the testis were either over-or under-dominant. Genes following D. n. nasuta dominance was twice (270 genes) than D. n. albomicans dominance (133 genes) in the ovary. In contrast, only 105 genes showed D. n. nasuta dominance and 207 showed D. n. albomicans dominance in testis transcriptome. Of the six expression inheritance patterns, conserved inheritance pattern was predominant for both ovary (73%) and testis (85%) in Cytorace-3. This study is the first to provide an overview of the expression divergence and inheritance patterns of the transcriptomes in an independently evolving distinct hybrid lineage of Drosophila. This recorded expression divergence in Cytorace-3 surpasses that between parental lineages illustrating the strong impact of hybridization driving rapid gene expression changes.
J. Bala Bhaskara Rao,V. Ramachandra Raju,B. B. V. L. Deepak 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.1
Most thermal/chemical industries are equipped with heat exchangers to enhance thermal efficiency. The performance of heat exchangers highly depends on design modifications in the tube side, such as the cross-sectional area, orientation, and baffle cut of the tube. However, these parameters do not exhibit a specific relation to determining the optimum design condition for shell and tube heat exchangers with a maximum heat transfer rate and reduced pressure drops. Accordingly, experimental and numerical simulations are performed for a heat exchanger with varying tube geometries. The heat exchanger considered in this investigation is a single-shell, multiple-pass device. A Generalized regression neural network (GRNN) is applied to generate a relation among the input and output process parameters for the experimental data sets. Then, an Artificial immune system (AIS) is used with GRNN to obtain optimized input parameters. Lastly, results are presented for the developed hybrid GRNN-AIS approach.